Email Data Validation

EMAIL Marketing Deliverability Troubleshooting Guide for AOL, Gmail, Yahoo, and iCloud

Deliverability is a moving target, and identifying why your message doesn't reach the inbox isn't always clear. The goal of this guide is to help illustrate how specific ISPs handle incoming mail, and share how messages can be optimized for better deliverability. If you are having difficulty with deliverability to all ISPs, you may want to take a look at sender reputation best practices and check out how your ESP protects deliverability. Before a message is delivered, the ISP must determine a) if the sender is legitimate, b) where the message should be placed, and c) if the recipient wants to receive the message. Each ISP has a different approach to inbox placement, filtering, whitelisting, and handling recipient actions.